play fast [at fast] and loose;be unsteady;blow hot and cold;change like a weathercock;caprice ;

Politically, they're unpredictable, and may strike us as treacherous.
政治上, 他们是难以预料的, 也许会叫我们觉得反复无常.
来源:词典精选例句Hermia was looking at him and wondering at his strange inconstancy.
赫米亚望着他,对他莫名其妙的反复无常感到很惊奇.
来源:词典精选例句
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